# Boiler type selector

Compare the storage layout you want with manufacturer definitions. This selects a layout to discuss, not a boiler size or an installation recommendation.

Use the tool on the [web page](https://boilerpros.fyi/tools/boiler-type-selector). It works without JavaScript.

## How to use it

1. Choose separate hot water cylinder in the proposed layout.
2. Choose cold water storage tank in the proposed layout.
3. Read the result.

## How it works

Definitions come from Worcester Bosch, Boilers explained, fetched 2026-11-10: https://www.worcester-bosch.co.uk/products/boilers/explained

Combi: mains hot water on demand without a separate hot water cylinder or cold water storage tank. System: a hot water cylinder, with main components built into the boiler and no loft tank required.

Regular, conventional or heat-only: a separate hot water cylinder and cold water storage tank. The manufacturer also describes a heating feed and expansion tank. The tool simplifies the layout for discussion.

There are no demand thresholds, savings estimates or output sizes in this tool. The engineer must assess water supply, heat loss, hot water use, equipment condition and installation constraints.

> Definition aid only. It does not size equipment, specify gas work or assess installation safety. Do not change a heating system based on this result.

## Questions

### Does the result mean this boiler suits my house?

No. It matches a storage definition only. An engineer needs to assess the property.

### Can I identify the existing system from tanks alone?

Not reliably. Equipment may have been altered. Ask an engineer to confirm the actual connections.